Re: 87 Chevy Crew Cab 4x4 Converion/Cummins swap
What size are on it now?
I'm running 235/85/16 on mine. They are fairly close on the rear but I've never had them rub even under heavily loaded gooseneck trailer. You MIGHT be able to get a 255/85/16 on it without rubbing as someone else mentioned above. If they did then a 1/2 or less spacer would probably be enough.
If you go any bigger than that then you gotta run spacers. I like how the 285's look on a square dually but I also like the tall skinny stock look.
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88' Chevy V30 3+3 4x4 Dually 454 TBI/NV4500/NP205
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